Run all finalizers whose exit priority is not None and at least minpriority Finalizers with highest priority are called first; finalizers with the same priority will be called in reverse order of creation.
(minpriority=None)
| 337 | |
| 338 | |
| 339 | def _run_finalizers(minpriority=None): |
| 340 | ''' |
| 341 | Run all finalizers whose exit priority is not None and at least minpriority |
| 342 | |
| 343 | Finalizers with highest priority are called first; finalizers with |
| 344 | the same priority will be called in reverse order of creation. |
| 345 | ''' |
| 346 | if _finalizer_registry is None: |
| 347 | # This function may be called after this module's globals are |
| 348 | # destroyed. See the _exit_function function in this module for more |
| 349 | # notes. |
| 350 | return |
| 351 | |
| 352 | if minpriority is None: |
| 353 | f = lambda p : p[0] is not None |
| 354 | else: |
| 355 | f = lambda p : p[0] is not None and p[0] >= minpriority |
| 356 | |
| 357 | # Careful: _finalizer_registry may be mutated while this function |
| 358 | # is running (either by a GC run or by another thread). |
| 359 | |
| 360 | # list(_finalizer_registry) should be atomic, while |
| 361 | # list(_finalizer_registry.items()) is not. |
| 362 | keys = [key for key in list(_finalizer_registry) if f(key)] |
| 363 | keys.sort(reverse=True) |
| 364 | |
| 365 | for key in keys: |
| 366 | finalizer = _finalizer_registry.get(key) |
| 367 | # key may have been removed from the registry |
| 368 | if finalizer is not None: |
| 369 | sub_debug('calling %s', finalizer) |
| 370 | try: |
| 371 | finalizer() |
| 372 | except Exception: |
| 373 | import traceback |
| 374 | traceback.print_exc() |
| 375 | |
| 376 | if minpriority is None: |
| 377 | _finalizer_registry.clear() |
| 378 | |
| 379 | # |
| 380 | # Clean up on exit |